一篇搞定SpringBoot后端框架搭建流程

一、项目初始化

1.idea创建springboot项目：2.7版本

2.pom依赖导入

<!-- web -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!-- mysql -->
<dependency>
    <groupId>com.mysql</groupId>
    <artifactId>mysql-connector-j</artifactId>
</dependency>
<!-- mybatis-plus -->
<dependency>
    <groupId>com.baomidou</groupId>
    <artifactId>mybatis-plus-boot-starter</artifactId>
    <version>3.5.2</version>
</dependency>
<dependency>
    <groupId>com.baomidou</groupId>
    <artifactId>mybatis-plus-generator</artifactId>
    <version>3.5.2</version>
</dependency>
<!-- freemarker -->
<dependency>
    <groupId>org.freemarker</groupId>
    <artifactId>freemarker</artifactId>
</dependency>
<!-- lombok -->
<dependency>
    <groupId>org.projectlombok</groupId>
    <artifactId>lombok</artifactId>
</dependency>
<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
        </dependency>

  <build>
        <plugins>
            <plugin>
                <groupId>org.apache.tomcat.maven</groupId>
                <artifactId>tomcat7-maven-plugin</artifactId>
                <version>2.2</version>
            </plugin>
        </plugins>
    </build>

3.application.yml

server:
  port: 9999

spring:
  datasource:
    username: root
    password: 123456
    url: jdbc:mysql:///xdb
redis:
  port:6379
  host:localhost


logging:
  level:
    com.example: debug

4.测试

成功部署到9999端口上

二、Mybatis-plus代码生成

1、代码生成器生成代码

1.1选择这个快速生成的

package com.example.springadmin;

import com.baomidou.mybatisplus.generator.FastAutoGenerator;
import com.baomidou.mybatisplus.generator.config.OutputFile;
import com.baomidou.mybatisplus.generator.engine.FreemarkerTemplateEngine;

import java.util.Collections;

public class Code {
    public static void main(String[] args) {
        String url = "jdbc:mysql:///springboot";
        String username = "root";
        String password = "123456";
        String author = "yezhaoxin";
        String outputDir = "D:\\Code\\Java\\Spring-admin\\src\\main\\java";
        String basePackage = "com.example";
        String moduleName = "sys";
        String mapperLocation = "D:\\Code\\Java\\Spring-admin\\src\\main\\resources\\mapper\\" + moduleName;
        String tableName = "x_user,x_menu,x_role,x_role_menu,x_user_role";
        String tablePrefix = "x_";
        FastAutoGenerator.create(url, username, password)
                .globalConfig(builder -> {
                    builder.author(author) // 设置作者
                            //.enableSwagger() // 开启 swagger 模式
                            //.fileOverride() // 覆盖已生成文件
                            .outputDir(outputDir); // 指定输出目录
                })
                .packageConfig(builder -> {
                    builder.parent(basePackage) // 设置父包名
                            .moduleName(moduleName) // 设置父包模块名
                            .pathInfo(Collections.singletonMap(OutputFile.xml, mapperLocation)); // 设置mapperXml生成路径
                })
                .strategyConfig(builder -> {
                    builder.addInclude(tableName) // 设置需要生成的表名
                            .addTablePrefix(tablePrefix); // 设置过滤表前缀
                })
                .templateEngine(new FreemarkerTemplateEngine()) // 使用Freemarker引擎模板，默认的是Velocity引擎模板
                .execute();
    }

}

2、启动类注解

@MapperScan("com.example.*.mapper")

3、测试

3.1在测试类中撰写方法测试

package com.example.springadmin;

import com.example.sys.entity.User;
import com.example.sys.mapper.UserMapper;
import org.junit.jupiter.api.Test;
import org.springframework.boot.test.context.SpringBootTest;

import javax.annotation.Resource;
import java.util.List;

@SpringBootTest
class SpringAdminApplicationTests {

    @Resource
    private UserMapper userMapper;

    @Test
    void testMapper() {
        List<User> users = userMapper.selectList(null);
        users.forEach(System.out::println);
    }

}

测试截图，成功打印

3.2 在Controller层测试

package com.example;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@MapperScan("com.example.*.mapper")
@SpringBootApplication
public class Demo1Application {

    public static void main(String[] args) {
        SpringApplication.run(Demo1Application.class, args);
    }

}

浏览器测试成功，URL查询打印

四、公共响应类

统一前后端数据的作用
新创建一个文件夹来控制相应数据。

package com.example.common.vo;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@Data
@NoArgsConstructor
@AllArgsConstructor
public class Result<T> {
    private Integer code;
    private String message;
    private T data;

    public static <T> Result<T> success() {
        return new Result<>(20000, "success", null);
    }

    public static <T> Result<T> success(T data) {
        return new Result<>(20000, "success", data);
    }

    public static <T> Result<T> success(T data, String message) {
        return new Result<>(20000, message, data);
    }

    public static <T> Result<T> success(String message) {
        return new Result<>(20000, message, null);
    }

    public static <T> Result<T> fail() {
        return new Result<>(20001, "fail", null);
    }

    public static <T> Result<T> fail(Integer code) {
        return new Result<>(code, "fail", null);
    }

    public static <T> Result<T> fail(Integer code, String message) {
        return new Result<>(code, message, null);
    }

    public static <T> Result<T> fail(String message) {
        return new Result<>(20001, message, null);
    }

}

成功将数据与前端相应

到此为止，基本的spring后端框架搭建完毕，上文包含一些不必要的测试，用来验证是否搭建成功